Slow when opening videos with no index

[Finalfantasykid]

Some programs do not include an index in the videos which can drastically slow down the program execution. A solution might be to do something like VLC does and prompt the user to build the index (this would rewrite the video file). For now you can manually build the index by running the following:

ffmpeg -i input.avi -map 0 -c copy output.avi

[Finalfantasykid]

Upgrading opencv to version 4.5.5 has partially fixed this. It otherwise is probably not very fixable.